Alex Fernandez schrieb:
The LyX code looked weird to me: \begin_inset Formula \[ \sum_{\mathclap{\substack{0<k<1000\\ \\k\,\in\,\mathbb{N}} }}^{n}k^{-2}\]What with the double slash in \\k. But if you confirm it is correct then it must be a parsing error.
The \\ starts a new line. Therefore one correctly gets:
0<k<1000
k \in \mathbb{N}
(three rows, one is empty)
regards Uwe
